变否定有好几个情态动词分别是什么

情态动词有can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought to等
他们的否定形式分别是：
can -----can't
could----couldn't
may ------may not
might----might not
must------mustn't
have to------don't have to
shall-------shan't
should-------shouldn't
will --------won't
would-------wouldn't
dare------darn't
need------need't
ought to------oughtn't to

情态动词的情态是什么意思？
情态动词有四类：
①只做情态动词：must,can(could),may(might)……
②可做情态动词又可做实义动词：need,dare,will
③具有情态动词特征：have(had,has) to,used to，ought to
④情态动词表猜测：一肯一否三不定（must一肯，can not一否，may，might，could，三不定。）
注：mustn't代表强烈禁止 must表示主观，have to表示客观。
情态动词，be动词，助动词有什么区别
be动词，情态动词，助动词do/does的用法区别及练习
1. 由连系am，is，are构成的句子：变一般疑问句时把am，is，are提到句子的前面，句尾用问号即可。变否定句时直接在am，is，are后面加not即可。例如：
肯定句:He is a student.
一般疑问句: Is he a student?
否定句: He is not a student.
画线提问: 对he提问: Who is a student?
对 a student 提问: What is he? or What does he do?

2. 由情态动词can, may, should等构成的句子: 变一般疑问句时把can,may,提到句子的前面,句尾用问号即可.变否定句时直接在can,may,后面加not即可. 例如:
肯定句: She can swim.
一般疑问句: Can she swim?
否定句: She can not swim.
画线提问: 对she提问: Who can swim?
对swim提问: What can she do?

3. 由行为动词构成的句子: 需要加助词do或does. 变一般疑问句时把do/does放在句子前面. 变否定句时把don’t/doesn’t放在动词的前面。要注意观察动词的形式并对号入座。一般疑问句和否定句的动词三单式都要变回原型。
play-----do plays-----does

例如:
肯定句: They play football after school. He plays football after school.
一般疑问句: Do they play football after school? Does he play football after school?
否定句: They don't (do not) play football after school. He doesn’t’ play football after school.
画线提问: 对they/he提问: Who plays football after school?
对play football提问: What do they do after school? What does he do after school?
对after school提问: When do they play football? When does he play football?

看不懂你在说什么。